400 silver thumbtacks are enough for daily use, and you can store the thumbtacks in clear plastic containers to keep the thumbtacks neatly stored and easily accessible Head diameter 10mm/0.39 inches, steel needle length 10mm/0.39 inches, easy to use, steel round head with sharp steel needle points for easy insertion and safe removal Confidently use thumbtacks to do manual work in the classroom, office, workplace, home, kitchen, or elsewhere, working in any environment and still keeping it bright and rust free Perfect for schools, offices, homes, art projects, bulletin boards, pin reminders, posters, marking maps, etc Made of nickel-plated iron, rust resistant, durable, long service life. Date First Available March 11, 2023